When I was trying to install SQL Server 2008 Enterprise Edition into my machine (32bit Windows XP SP3) by clicking "setup.exe" from installation directory of SQL server 2008. An error message box was popped-up with message "Microsoft .NET Framework 3.5 installation has failed. SQL Server 2008 Setup requires .NET Framework 3.5 to be installed.". I uninstalled and re-installed Framework 3.5 again. The same problem still shows up. Please advise for any possible solutions. Thank you.